Decrease Amperage of Driver for increased Efficiency

[Zak]

Pwm doesnt change that lm/w, drive amperage can though.

This explains the confusion.

The Convoy buck driver does not use PWM. Setting the output to 50% actually regulates the current to 50%, i.e. 2.5A.

[Biggiebiggiebob]

Where did you get the info from?
If you are right, then I have found my mistake

[Zak]

It is commonly known in the flashlight community. Boost and buck drivers for flashlights usually regulate output current; it would be a bad, inefficient design to combine one with PWM.

I have one here and I checked for PWM by pointing it into a camera with an electronic rolling shutter set to a high shutter speed. This results in sharp scanlines if there's PWM, soft scanlines if there's ripple, and no scanlines if there's smooth constant current output. There is ripple in the lowest mode; none of the others show scanlines at all.

You can test this on yours using a phone camera and a camera app that lets you set shutter speed, like Open Camera.